Influence of Citric Acid on Structures and Catalytic Activities of Ru/AC Catalysts for Ammonia Synthesis

被引：3
作者：
Ni Jun [1 ]
Wang Rong [1 ]
Lin Jian-Xin [1 ]
Wei Ke-Mei [1 ]
机构：
[1] Fuzhou Univ, Natl Res Ctr Chem Fertilizer Catalysts, Fuzhou 350002, Peoples R China
来源：
ACTA PHYSICO-CHIMICA SINICA | 2009年 / 25卷 / 03期
关键词：
Citric acid; Ruthenium; Dispersion; Activity; Ammonia synthesis; SUPPORTED RUTHENIUM CATALYSTS; ACTIVATED CARBON; HNO3; OXIDATION; RU; BARIUM; ADSORPTION; NANOTUBES; NANOPARTICLES; DISPERSION; PROMOTERS;
D O I：
10.3866/PKU.WHXB20090320
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Citric acid (CA) was used to modify graphitic activated carbon (AC) to improve the ruthenium distribution and the catalytic activity of Ru/AC catalyst. The influence of CA on the texture of AC and Ru/AC, Ru dispersion and catalytic activity were investigated. Transmission electron microscopy (TEM), thermogravimetric analysis (TGA), CO pulse chemisorption and N-2 physisorption indicated that minor amounts of citric acid significantly decreased the surface area of AC and increased the content of oxygen-containing functional groups on the surface of AC. This is the result of preferential adsorption of CA in AC micropores which improves the particle distribution of Ru. The optimal loading sequence is CA followed by RuCl3. A suitable content of CA in Ru/AC catalysts has a remarkable influence on the activities of Ru/AC catalysts at low reaction temperature. The greatest increase of activity was 21.4% for the Ru/AC catalysts treated with CA.
引用
收藏
页码：519 / 524
页数：6
相关论文
共 32 条
  • [1] Bielawa H, 2001, ANGEW CHEM INT EDIT, V40, P1061, DOI 10.1002/1521-3773(20010316)40:6<1061::AID-ANIE10610>3.0.CO
  • [2] 2-B
  • [3] Surface oxides on carbon and their analysis: a critical assessment
    Boehm, HP
    [J]. CARBON, 2002, 40 (02) : 145 - 149
  • [4] Surface modification of a granular activated carbon by citric acid for enhancement of copper adsorption
    Chen, JP
    Wu, SN
    Chong, KH
    [J]. CARBON, 2003, 41 (10) : 1979 - 1986
  • [5] Influence of HNO3 oxidation on the structure and adsorptive properties of corncob-based activated carbon
    El-Hendawy, ANA
    [J]. CARBON, 2003, 41 (04) : 713 - 722
  • [6] The effect of promoters on the electronic structure of ruthenium catalysts supported on carbon
    Guraya, M
    Sprenger, S
    Rarog-Pilecka, W
    Szmigiel, D
    Kowalczyk, Z
    Muhler, M
    [J]. APPLIED SURFACE SCIENCE, 2004, 238 (1-4) : 77 - 81
  • [7] Effect of activated carbon on the dispersion of Ru and K over supported Ru-based catalyst for ammonia synthesis
    Han, Wenfeng
    Liu, Huazhang
    Zhu, Hong
    [J]. CATALYSIS COMMUNICATIONS, 2007, 8 (03) : 351 - 354
  • [8] Reactivity of different kinds of carbon during oxidative purification of catalytically prepared carbon nanotubes
    Hernadi, K
    Siska, A
    Thiên-Nga, L
    Forró, L
    Kiricsi, I
    [J]. SOLID STATE IONICS, 2001, 141 : 203 - 209
  • [9] The kinetics of ammonia synthesis over Ru-based catalysts .1. The dissociative chemisorption and associative desorption of N-2
    Hinrichsen, O
    Rosowski, F
    Hornung, A
    Muhler, M
    Ertl, G
    [J]. JOURNAL OF CATALYSIS, 1997, 165 (01) : 33 - 44
  • [10] Boron nitride: A novel support for ruthenium-based ammonia synthesis catalysts
    Jacobsen, CJH
    [J]. JOURNAL OF CATALYSIS, 2001, 200 (01) : 1 - 3
1234